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Using an Enterprise Service Bus (ESB) model is recommended when you have multiple business applications, data repositories and data consumers that need to talk to each other through a service layer that contains the rules and a common framework on how to communicate between those entities.

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Electronic communications protocol FIX (Financial Information eXchange) allows brokers and trading platforms to communicate with each other and exchange messages related to securities transactions. It’s based on real-time TCP/IP socket connection and the session is persisted during the data exchange between the two entities.